Problem 6 Briefly describe what occurs in ... [FREE SOLUTION]

Chapter 12: Problem 6

Briefly describe what occurs in each of the phases of the cell cycle: \(\mathrm{G}_{1}, \mathrm{~S}, \mathrm{G}_{2}\), mitosis, cytokinesis.

Short Answer

Expert verified

In \( \text{G}_{1} \), the cell grows; in \( \text{S} \), DNA is replicated; in \( \text{G}_{2} \), the cell prepares for mitosis. Mitosis divides the nucleus, and cytokinesis divides the cytoplasm, forming two cells.

Step by step solution

Describe \( \text{G}_{1} \) phase

In \( \text{G}_{1} \) phase, the cell grows and carries out normal metabolic functions. It is also the phase where the cell synthesizes various enzymes and nutrients that are needed for DNA replication and subsequent cell division.

Describe \( \text{S} \) phase

During the \( \text{S} \) phase, DNA replication occurs. The cell synthesizes a complete copy of the DNA in its nucleus, ensuring that each daughter cell will have an identical set of chromosomes.

Describe \( \text{G}_{2} \) phase

In the \( \text{G}_{2} \) phase, the cell continues to grow and produce proteins. This phase also involves checks to ensure DNA was replicated correctly, and the cell prepares for mitosis.

Describe mitosis

Mitosis is the process where the cell's nucleus divides. It consists of several stages (prophase, metaphase, anaphase, and telophase) during which the duplicated chromosomes are separated and distributed into two daughter nuclei.

Describe cytokinesis

Cytokinesis is the final step in the cell cycle, where the cytoplasm divides and two daughter cells are formed. Each cell receives one nucleus and a portion of the organelles and cytoplasm from the parent cell.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

G1 Phase

In the G1 phase, the cell ramps up its growth and starts performing its regular functions. It synthesizes essential enzymes and nutrients needed for the upcoming stages of the cell cycle.

Growth is a key feature here, allowing the cell to increase in size.
Enzymes and nutrients are crucial as they prepare the cell for DNA replication.
Metabolic activities continue as usual, ensuring the cell stays healthy and active.

This phase ensures the cell is well-prepared for the next stage, where it will duplicate its DNA.

S Phase

The S phase is all about DNA replication. In this phase, the cell creates an exact copy of its DNA, so each daughter cell has the same genetic material.

The entire DNA in the nucleus is replicated carefully.
This ensures that the genetic information is preserved accurately.
Chromosomes are duplicated so every daughter cell can get a complete set.

Successful completion of this phase ensures genetic fidelity in the resulting daughter cells.

G2 Phase

During the G2 phase, the cell keeps growing and producing proteins that are essential for cell division. This phase also includes important checks.

The cell verifies that DNA replication was done correctly, fixing any errors that occurred.
Other organelles and cell structures required for mitosis are produced.
The cell prepares all the necessary items for the next phase, mitosis.

This preparation and error-checking is crucial for ensuring that cell division proceeds smoothly and correctly.

Mitosis

Mitosis is the stage where the cell鈥檚 nucleus divides. It has several steps:

Prophase: Chromosomes condense and become visible. The nuclear envelope begins to disappear.
Metaphase: Chromosomes line up in the middle of the cell.
Anaphase: Chromosomes are pulled apart to opposite ends of the cell.
Telophase: New nuclear membranes form around each set of chromosomes, creating two new nuclei.

By the end of mitosis, two nuclei are created from the original one, each ready to be enclosed in a new cell.

Cytokinesis

Cytokinesis is the final step, where the cell鈥檚 cytoplasm divides to create two separate daughter cells.

The cell's membrane pinches in and splits the parent cell into two new cells.
Each new cell has its own nucleus and a portion of the original cell鈥檚 organelles and cytoplasm.
This division ensures that each daughter cell can survive independently and carry out normal functions.

Cytokinesis completes the cell cycle, producing two genetically identical cells ready for their own cycles.

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91影视

Briefly describe what occurs in each of the phases of the cell cycle: \(\mathrm{G}_{1}, \mathrm{~S}, \mathrm{G}_{2}\), mitosis, cytokinesis.

Short Answer

Step by step solution

Describe \( \text{G}_{1} \) phase

Describe \( \text{S} \) phase

Describe \( \text{G}_{2} \) phase

Describe mitosis

Describe cytokinesis

Key Concepts

G1 Phase

S Phase

G2 Phase

Mitosis

Cytokinesis

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